https://online2.tingclass.net/lesson/shi0529/0009/9907/191.mp3
https://image.tingclass.net/statics/js/2012
講解文本：
backup 備份，替補，后援
Just admit it, you're a backup, she dosen't like you.
你就承認(rèn)了吧，你只是一個備胎，她不喜歡你。
She is keeping you around just as a backup.
她把你留在身邊，只是作為一個備胎。
瘋狂練習(xí)吧!
